Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ad91c7aa83ad25…

MALICIOUS

PDF

75.5 KB Created: 2021-06-11 09:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: de8aff9fba160cf0be5e8ae23fb0eccd SHA-1: 12c6849bc52467bd3dcc5310679807d4256cdade SHA-256: e1ad91c7aa83ad2560b896d003f21b6d3f119bb68c590d0eb6e53662f27feacd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier's high score further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=stagnetti+revenge+full+movie+download PDF link annotation
    • http://4bx.pl/public/file/jiguwoloxalovavivuwowazo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jefomajuxozelakerubo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160847493b36e4---xojipojikipewom.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/zeremabukofufazujijit.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/wafawi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/9708109741.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/809325ec6bebaf5a87b4eb279fdf64d8/8598780788.pdfIn PDF document text
    • http://lucann.com/Upload/file/31742881342.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d2b81420---16096351664.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/4064375387.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608137c9a167d---8137326506.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160718d44776f5---butarasilu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4159e0ffe911891d3ec8ea028d7f7f3e/sikegok.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160708fad538af---vodenafowedemisud.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/tawovixapedolupatad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 5188 bytes
SHA-256: 2ec6c438a8d907aa46cc22d2a17a86593c24706646ea86987b4cc80f298f293a
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10492 bytes
SHA-256: c8e0e9a270bb549b83b5ff4b13a38e9392138cb2e0d1252d7958a0583c1cc713
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378